Factual error: In the scene immediately following Harry and Hermione's travel back through time, she tells him, "It's 7:30." The clock, however, is striking the bells for an hour, not a half-hour. (01:43:45)
Factual error: When Harry is beating up Malfoy and the two Slytherin boys in front of the Shrieking Shack, he grabs one of them by his scarf and rotates him around. The center of their revolutions should be at the end of the scarf (where Harry grabs it), but as there is no actual counterweight for the boy he has to balance only his own body, which moves the center of his revolution strongly towards him. (01:00:10)
Chosen answer: It's not known what it is. It is left to the audience's imagination of what exactly is in the room or what some witch or wizard was doing in there. This is only meant to be a humorous bit and is unrelated to the plot. It didn't happen in the book.
raywest ★